What color is #3F373D?

#3F373D is a dark low-chroma warm gray with a subtle warm cast. In RGB it is rgb(63, 55, 61), and in HSL hsl(315, 7%, 23%).

Is #3F373D accessible as text?

On white, #3F373D has a contrast ratio of 11.51:1 (passes WCAG AA for body text); on black it is 1.83:1 (fails). For text placed on #3F373D, use white for the best readability.

What is the closest Tailwind color to #3F373D?

The nearest Tailwind CSS token is zinc-700 (#3F3F46).

What colors go well with #3F373D?

As a neutral, #3F373D pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #3F373D the same as CSS darkslategray?

No — #3F373D is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#3F373D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3F373D

Not just a swatch — here's how #3F373D works with other colors. Named schemes with #3F373D in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #3F373D Surface #14161A Highlight #F4F6F8 Secondary #5D6573 Accent #5F575D

Onyx is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Onyx.

Vintage Leather Lead · 5 colors

Lead #3F373D Secondary #7D472D Surface #ECD8C1 Accent #464F38 Anchor #592233

Onyx plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Japanese Sand Base · 5 colors

Base #3F373D Surface #F1E8DC Highlight #F7F0E7 Secondary #BCADA0 Ink #2B2723

Onyx sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Berry & Cream Lead · 5 colors

Lead #3F373D Surface #F4E6D7 Anchor #5D203C Accent #E6C2C5 Secondary #332B2E

Onyx sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #3F373D Secondary #625F61 Support #9C9087 Ink #18140F

Onyx is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Onyx carrying the quiet middle.

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Color Lab

How #3F373D actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 51/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 61/100

High

Mid depth — usable as an accent or a muted ground.

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 36/100

Low

A faint retro warmth without tipping into sepia.

Luxury 63/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 6/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 30/100

Low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 58/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 98/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3F373D

For UI

For branding

For interior

For fashion

People also use #3F373D with

Outer Space Onyx Gainsboro Taupe

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 11.5:1. Use

Subtle surface Use #DAD6D9 for cards and hover fills. Tint 80

Avoid beside #3F373A — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #3F373D at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #3F373D;
  --color-base-rgb: 63 55 61;
  --color-base-oklch: oklch(34.7% 0.015 334.6);
  --color-50: #F8F7F8;
  --color-100: #ECE9EB;
  --color-200: #D9D3D8;
  --color-300: #BCB3BA;
  --color-400: #9F939C;
  --color-500: #81747D;
  --color-600: #655D63;
  --color-700: #4A4549;
  --color-800: #322F31;
  --color-900: #201D1F;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F8F7F8',
    100: '#ECE9EB',
    200: '#D9D3D8',
    300: '#BCB3BA',
    400: '#9F939C',
    500: '#81747D',
    600: '#655D63',
    700: '#4A4549',
    800: '#322F31',
    900: '#201D1F',
  },
}

$base: #3F373D;
$base-ink: #FFFFFF;
$base-50: #F8F7F8;
$base-100: #ECE9EB;
$base-200: #D9D3D8;
$base-300: #BCB3BA;
$base-400: #9F939C;
$base-500: #81747D;
$base-600: #655D63;
$base-700: #4A4549;
$base-800: #322F31;
$base-900: #201D1F;
$base-hover: #322C31;
$base-subtle: #C7C1C6;

{
    "color": {
        "base": {
            "value": "#3F373D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F8F7F8",
                "type": "color"
            },
            "100": {
                "value": "#ECE9EB",
                "type": "color"
            },
            "200": {
                "value": "#D9D3D8",
                "type": "color"
            },
            "300": {
                "value": "#BCB3BA",
                "type": "color"
            },
            "400": {
                "value": "#9F939C",
                "type": "color"
            },
            "500": {
                "value": "#81747D",
                "type": "color"
            },
            "600": {
                "value": "#655D63",
                "type": "color"
            },
            "700": {
                "value": "#4A4549",
                "type": "color"
            },
            "800": {
                "value": "#322F31",
                "type": "color"
            },
            "900": {
                "value": "#201D1F",
                "type": "color"
            }
        }
    }
}